Wire Harness MPFI to SS MAP Adapter

The Holley Wire Harness MPFI to SS MAP Adapter (part number 558-466) is designed for those retrofitting a carbureted or older EFI engine with contemporary Holley EFI technology. This adapter is particularly useful for hot rod or restoration projects where accurate MAP signal integration is crucial. It bridges the gap between modern multi-port fuel injection systems and classic Speed Shop manifold absolute pressure sensing.

This adapter harness converts the connector configuration from standard MPFI wiring protocols to Holley's Speed Shop MAP sensor pinout, ensuring seamless communication between your fuel injection controller and vacuum-referenced pressure measurement. Its compact design allows for easy installation in tight engine bays without excessive slack or routing complications. Weighing just 0.12 lbs, it is built to withstand underhood heat and vibration.

Street rodders, engine swap specialists, and tuners will benefit from the accurate MAP signal translation provided by this adapter. It helps prevent boost creep in forced induction applications and maintains precise fuel mixture correction across the RPM range. This is especially important in carb-to-EFI conversions where original sensor positioning may differ from factory specifications.